Discover our solutions for cleanrooms and pharma

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High air purity is the essential requirement for sensitive controlled technical processes. Cleanrooms are used as they ensure a low-particle or, when necessary, a low-germ environment. The multi-stage Viledon filter concept can filter particles and harmful germs from the air in a reliable and energy-saving way.

The multi-stage Viledon air filtration system

The principle is simple and efficient: well-matched filter stages with Viledon air filters of various filter classes and designs. Usually a two-stage prefiltration consisting of Viledon pocket filters and cassette filters removes coarse to fine particles. Viledon EPA, HEPA and ULPA filters are used as a final filter stage. They are responsible for reliably arresting finest particles and germs and can be used in cleanrooms with turbulent or low-turbulent airflow.

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[Translate to English (US):] reinräume und Pharma mehrstufiges viledon Filterkonzept

Customized filter concepts for your application


When the surgeon takes the scalpel in the operating room, the highest hygiene standards must be ensured. This also applies to the air filtration, which must function reliably at all times.

Semiconductor manufacturing

Whether microprocessors or microcontrollers, solar cells, photodetectors or light diodes are concerned, every minuscule particle can impair the performance of technical products.


In nano research, orders of magnitude range from 100 nanometers to individual atoms. The tiniest foreign particles will have a negative effect on the processes and must be removed from the air.

Optics and laser technology

Optics and laser technology require maximum precision. Maximum air purity is, therefore, an essential requirement for the best results.

Pharmaceutical industry

In the manufacture of pharmaceuticals and active ingredients, it is crucial that germs and particles are reliably removed from the air to prevent contaminations and to ensure product purity.


A multitude of various applications fall under the term biotechnology. What they have in common is a high demand for purity. Enzymes, cells, and organisms can be used only when high purity is achieved.

Services and Engineering

In addition to high-quality products, Viledon stands for excellent service, which guarantees you the maximum benefit of our air filters.

Viledon Engineering for cleanrooms

Complete air filter systems and comprehensive service from a single source

Freudenberg Filtration Technologies combines a comprehensive range of reliable and energyefficient filtration solutions with technical development and installation know-how for multi-stage filtration systems.

Viledon Engineering provides a complete service and installation program, including all construction elements for building new or modifying existing air filtration systems, especially in areas with stringent requirements on clean air quality.

Our Engineering teams are based all over the world and work closely with customers to provide efficient solutions no matter what size and scale the project has. Each Engineering solution is customized according to the requirements of each specific application. We use different construction types and a comprehensive range of components.

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How efficient is your filtration system?

Find the optimal filter solution for your plant with e.FFECT based on ISO 16890

Standardized systems for supply air filtration are frequently inefficient and do not make full use of their potential for optimization. The more specifically filter systems are customized to the respective ambient conditions and plant requirements, the greater performance and reliability they achieve.

Our experts work with you to develop the best filter solution for your plant on the basis of the testing standard ISO 16890. In the filter evaluation, typical urban and rural particle size distributions are considered based on the particulate matter fractions PM1, PM2,5 and PM10, and filter arrestance efficiencies are determined accordingly.

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With e.FFECT, the electronic Freudenberg Filter Efficiency Calculation Tool, calculating the optimal filter solution is extremely simple. The local ambient conditions and specific process requirements enter directly into the calculation. Multi-stage filter systems can then be objectively compared. This simplifies the selection of the best filter concept for your needs.

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ISO 16890 Particle size cleanroom and pharma Exemplary particle classification to PM fractions

Hygiene standards for maximum protection

Requirements for cleanrooms

Particularly strict regulations apply to cleanrooms. Airborne particles and germs must be reduced to an absolute minimum in order to protect highly sensitive products and processes.

Hygiene guidelines define clear specifications for ventilation and air-conditioning systems and units in sensitive application areas such as cleanrooms.

Classification of cleanrooms

EN ISO 14644-1

For the production rooms, the purity levels of the air vary depending on the product as stipulated in EN ISO 14644-1. This guideline classifies rooms according to their particle count per cubic meter (m³).
Test methods for EPA, HEPA and ULPA filters

EN 1822

In Europe, EPA, HEPA und ULPA filters are subject to classification according to EN 1822 for filtration efficiency and zero leakage. HEPA and ULPA filters are also subject to individual tests.
Viledon air filters satisfy the requirements

VDI 6022

VDI Guidelines 6022 “hygiene requirements for ventilation and air-conditioning systems and units” defines clear specifications for the use in sensitive application areas, such as clean rooms. Viledon pocket and HEPA filters satisfy all VDI 6022 criteria without restrictions.

In our download area, you will find detailed information about our technologies.

Reliable for sterile air and cleanrooms

Multi-stage Viledon air filtration systems

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Discover our products for cleanrooms and pharma.

Click on details for more information. Technical data and specific product features can be found in the product catalog.

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